* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
  }
  
  .feature{
    background-color:#333;
    color:white;
    padding-right:0px;
    padding-top:0px;
    width:25px;
    height:25px;
    float:right;
    font-size:20px;
  }

  .feature:hover{
    background-color: red;
  }

  header {
    background-color: #333;
    color: white;
    text-align: center;
  }

  h1{
    padding:30px;
  }
  
  main{
    padding:30px;
  }

  .main img {
    display:block;
    width:250px;
    height:250px;
    margin:auto;
    margin-top:30px;
    margin-bottom:30px;
  }
  
  hr {
    margin-top:30px;
  }

  p {
    font-size: 16px;
    margin-bottom: 20px;
    text-align: center;
  }
  
  .remind p {
    color:red;
    font-size: 25px;
    margin-top:40px;
  }
 
  footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    width: 100%;
  }